“What can you do about it? There are always ways to beat the system through,” one passenger told CBS 2’s Christine Sloan. “You just have to live your life.”

“I would hate to think it’s part of the staff there; you have to trust your people,” Richard Van Eenennaam, of New Jersey, said. “If you don’t trust your people, we have problems.”

Authorities said they want to know how the stun gun made it on board.

The TSA said it has several different levels of security that passengers can’t see, including armed pilots, fortified cockpit doors and on-board federal marshals.

“Maybe some cop dropped it or something,” Rob Reehm, of California, said. “I’m not that concerned.”

Either way, federal authorities in Boston said they have found prohibited items on planes, and their job is to find out how this one got on.

The investigation will include scrutiny of all airport employees, each of whom goes through tight background checks.

Monday’s incident was just the latest security breach now being investigated by the TSA. Two weeks ago, Nigerian-American Olajide Noibi boarded a Virgin American flight from New York to Los Angeles without a passport and with an expired boarding pass that didn’t belong to him. Authorities said he was found with numerous other discarded boarding passes.

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